Make chapter links in compiletest not be code
Make chapter links in compiletest not be code

mdBook doesn't display links inside code, so these links look very confusing.
Additionally, these types of links don't seem to be code on other pages of the book.
rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide,rust-lang/rustc-dev-guide